EXHIBIT 13 - PRE-CONSTRUCTION ACTIVITIES...

GSA National Capital Region

U.S. General Services Administration 301 7th Street, SW Washington, DC 20407 www.gsa.gov

May 26, 2015

Mr. Tim Dennee State Historic Preservation Office 1100 4th Street, SW, Suite E-650 Washington, DC 20024

VIA ELECTRONIC MAIL

RE: St. Elizabeths National Historic Landmark, Washington, DC Campus Master Plan Implementation – Center Building Rehabilitation and Modernization

Dear Mr. Dennee,

In accordance with 36 CFR Part 800, et seq. and the provisions of the Programmatic Agreement (PA) executed on December 9, 2008, GSA is engaged in ongoing Section 106 consultation regarding the proposed rehabilitation and modernization of the Center Building (Buildings #1 through 6 and #8) under the St. Elizabeths Master Plan.

As discussed during our May 19, 2015 S106 Consultation, GSA is proposing to undertake pre-construction activities, as defined below, at the Center Building to protect the building from further deterioration, stabilize the building, and install façade bracing and underpinning in preparation of forthcoming rehabilitation efforts. I have determined that these pre-construction activities will not constitute an adverse effect and that the timing and execution of these activities will not restrict GSA’s and the consulting parties’ subsequent consideration of alternatives to avoid, minimize or mitigate the undertaking’s adverse effects on historic properties in accordance with 36 CFR Part 800.1.

GSA seeks your concurrence to undertake the following pre-construction activities in advance of the execution of a Memorandum of Agreement so that Grunley may proceed with necessary repairs and stabilize the building, commencing with underpinning the exterior walls and installing exterior wall bracing around the entire structure.

A. Removal of non-contributing additions

The removal of non-contributing one-story structures and non-contributing day rooms is necessary to expose the original exterior wall and allow for efforts to stabilize and brace the building. Removal of these structures will be done using hand tools to protect adjacent contributing features. Work will be performed in accordance with the Secretary’s Standards. Consistent with the 2010 Historic Structures Report (HSR), these structures will not be reinstalled and associated materials will be disposed of. Note the red and green elements in the plan below.

EXHIBIT 13 - PRE-CONSTRUCTION ACTIVITIES CORRESPONDENCE TO DCSHPO


U.S. General Services Administration 301 7th Street, SW Washington, DC 20407 www.gsa.gov Page 2 of 8

B. Removal of all plaster at interior face of exterior walls

Due to the deteriorated condition and need to expose the interior face of the exterior walls for further evaluation of the structural integrity of the wall, all of the plaster on the interior face of the exterior walls will be removed and the plaster will be disposed of. Removal will be done using a chipping hammer chisel carefully placed at an angle to shave the plaster off the wall without damaging the brick. Residual plaster adhered to the wall will be removed using hand tools. Wood decorative elements (trim, baseboard and moldings) in sound condition as determined by Grunley’s conservator, adhered to the plaster at the interior face of the exterior walls located within in the Restoration Zone, as documented in the HSR (see



plan below), will be salvaged, inventoried, photographed and stored for possible restoration or reconstruction. Where present, decorative plaster moldings and elements at the interior of the building are more intact and less deteriorated than at the perimeter walls. Decorative plaster moldings and elements (such as plaster crown molding, coves, arches and imposts, overdoors, and medallions) have been measured, photographed, and representative intact samples have been identified for salvage for possible replication and reinstallation. Any decorative plaster unique to the interior face of the exterior walls in the Restoration Zone, as documented in the HSR (see plan below), will be salvaged, inventoried, photographed and stored for possible replication or restoration and reinstallation.

C. Removal of all window sash and trim

Grunley will enlist qualified professionals to conduct a full window condition assessment to evaluate the condition of all the window sash and trim throughout the building. Window trim includes decorative casing, stops, parting beads, sash pulls, pulleys, weights, sills, and stools. The team, in consultation with the DCSHPO and GSA RHPO, will develop a methodology for decision-making at the time of sash removal based on three categories: (a)



sash and/or trim that could be retained and reused with some repair; (b) sash and/or trim that could be repaired and possibly reused, depending on the sash configuration; (c) sash and/or trim with substantial missing or deteriorated elements that will be disposed of. Upon concurrence of the proposed methodology for categorization of the window sash and trim, Grunley’s qualified professionals will remove window sash and disassemble and remove window trim in accordance with the Secretary’s Standards so that the full-building exterior wall bracing can be installed through the window openings. Sash and trim selected for repair and reuse will be inventoried, crated and relocated to an off-site location where abatement and repair will take place. Sash and trim too severely deteriorated to be reused will be disposed of. All of the window frames will remain in situ and will be abated for lead. Several decorative iron grilles are extant and will be salvaged for GSA. Rehabilitation work will occur during the construction phase and will be consulted on in upcoming Section 106 consultation and will be documented in a forthcoming Memorandum of Agreement for the project undertaking.

D. Masonry Repair Exterior walls are generally four wythes thick but are missing material and/or failing in locations throughout the building. Masonry repairs to make the envelope structurally sound must be completed before the building can be stabilized and braced or the underpinning installed. The repair work will concentrate on the ground level and will include grouting existing cavities, and rebuilding collapsed or unstable portions of the building envelope. The degree of work to be done in accordance with these pre-construction activities is limited to in-kind repairs and will be reviewed and approved by the GSA RHPO and performed in accordance with the Secretary’s Standards by



qualified professionals. Sound exterior face brick removed as part of the repairs will be salvaged and reinstalled on the building’s façade. Interior brick will be replaced with new brick that meets compressive and absorptive requirements and matches the original in size. Any restoration work will occur during the construction phase and will be consulted on in a future Section 106 consultation and will be documented in a forthcoming Memorandum of Agreement for the project undertaking.

E. Removal of the Brick Skirt, Select Landscape Features, Areaways, and Exterior Stairs

The brick paving skirt, select landscape features (including the circular pond and fountain, iron fences, bird bath remnants, lamp bases, and two trees and shrubs), areaways and exterior stairs (all elements are noted on the plan below) need to be removed to protect these contributing features while the bracing is installed and underpinning is conducted around the perimeter of the building. GSA will first revalidate the existing conditions of the features to be removed through HABS drawings, plans, and photos. Grunley will develop a system to salvage, inventory and store the removed features in a protected location on site. All above features will be removed using hand tools, repaired as needed and reinstalled in their original location and layout upon construction

completion.



F. Removal of contributing wooden porches

In addition to the above noted items, I would appreciate your reconsideration of our request to remove the contributing but deteriorated wooden porches at Building 8 as part of our pre-construction activities with no adverse effect.

The contributing wooden porches are severely deteriorated in areas of the porch frame, floor deck, and roof, which have lead to the partial collapse of the floor. It’s also evident that the porches have been the subject of previous repairs with inappropriate replacement components. To stabilize the building, bracing must be installed around all of the exterior facades of the building. If the porches are to remain, we will not be able adequately brace these portions of the façade, leaving them vulnerable to continued deterioration and creating an unsafe work environment for the construction team. GSA commits to salvage of the sound historic porch elements and the replication of unsound historic elements so that the porch elements are reconstructed to meet the Secretary of the Interior’s Standards for the Treatment of Historic Properties. The porches will be rebuilt to the original dimensions and appearance once the brick wall of the building



has been stabilized and braced, as well as inspected and repaired as necessary. The porches will be reinstalled in accordance with the Secretary’s Standards for Rehabilitation and Reconstruction. We will be able to determine how much wood is salvageable once the protective boards are removed. Decorative porch features such as sound wood columns, railings, ceiling boards and crown molding will be salvaged, inventoried, photographed and stored for repair or replication. The remaining elements of the wooden porches that are too severely deteriorated to be repaired will be replicated to match the porch as it was originally built in 1895 in dimension, material and profile. HABS drawings and other archival documentation of Building 8 are available for our use as documentary evidence of the porches. Note the blue areas in the plan below. If approved, removal of the two porches will be done using hand tools to protect adjacent historic fabric.

I have determined that the above activities will have no adverse effect on the Center Building, nor preclude further consultation on ways to avoid, minimize, or mitigate adverse effects on the Center Building and adjacent landscape features. Some of these proposed activities remove non-contributing elements. Some allow for necessary forensic investigation of the exterior wall, building stabilization and repair, and installation of bracing and underpinning of the building. The window sash removal and salvage will be guided by a decision methodology to be further consulted on with you, per Section 800.5(b).



I would appreciate your consideration of my No Adverse Effect determination for these proposed pre-construction activities as described above so that we may proceed with the stabilization and protection measures for the building. In my absence, please contact Danielle Breaux at [email protected] if you would like to discuss the determination further or if you need additional information or documentation before you reach a decision. As always, thank you for your ongoing consultation and guidance, and your review of GSA’s undertaking at the St. Elizabeths campus. Sincerely,

Nancy Witherell Regional Historic Preservation Officer

8/6/2015 GSA.gov Mail St. Es PreConstruction Activities Followup

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Danielle Breaux WPSC <[email protected]>

St. Es PreConstruction Activities Followup1 message

Danielle Breaux WPSC <[email protected]> Wed, Jun 17, 2015 at 5:43 PMTo: Timothy Dennee <[email protected]>Cc: Nancy Witherell WPDA <[email protected]>, Kristi Tunstall WPDC <[email protected]>, MinaWright WPD <[email protected]>, Kirsten Kulis <[email protected]>

Tim,Thank you for your time last week. As discussed, our consultants and conservators have been at the site lookingat various ways to remove the wooden porch and have also provided additional information regarding themasonry repair. Please see below and attached and let us know if you have questions, need additionalinformation or wish to discuss further. Thank you for your time associated with this matter.

For Item F Removal of the wood porches at Building 8.

The porch cannot be removed in one piece

as it is severely deteriorated and suffers loss of structural and physical integrity. Some elements such as thecornice and bead board ceiling will be salvaged for possible reuse. The original decorative brackets are not extantand will be reconstructed per historic photographs. The majority of the flooring is in severely deterioratedcondition and we do not recommend it be reinstalled. The structural framing and porch railing cannot bereinstalled because it does not meet current code requirements. Our intention is to consult with you and theConsulting Parties on the reconstruction treatment associated with the porch during our upcoming consultationmeetings as it will be a component of our forthcoming MOA.

For Item D Masonry Repair

The masonry repairs will occur between grade and the top of the finish floor of Level 1. Most of the GroundLevel is below grade

and from the interior we are referring to work at the upper basement to the finish floor at the first floor. Attached is a partial south elevation indicating the area impacted by this activity. We estimate that this repairwork is approximately 15% of the existing masonry at the Ground Level and it is approximately 2% of themasonry for the entire building envelope.

A DRAFT specification for the masonry repairs which includes the mortar and cleaning specifications is

also attached.

Masonry repairs between grade and the finish floor of Level 1 are needed to stabilize the building. Repair workwill only be done where there is missing brick or there is evidence of structural damage such as cracked brick ordisplaced sections of the façade, and there is a concern of possible failure or collapse of the masonry wall. Thiswork needs to be done in conjunction with the bracing of the building and prior to the underpinning effort.

8/6/2015 GSA.gov Mail St. Es PreConstruction Activities Followup

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Masonry repair for this activity is full depth brick removal at the specific locations identified by the structuralengineer and the historic preservation team. The exterior face brick will be salvaged for reinstallation at thebuilding’s façade. Interior brick will be replaced with new brick that meets compressive and absorptiverequirements and matches the original in size.

The degree of work to be done in accordance with these preconstruction activities is limited to inkind repairsand will be reviewed and approved by the GSA RHPO and performed in accordance with the Secretary’sStandards by qualified professionals.

To clarify, masonry restoration is a future separate activity that is not part of these preconstruction activities andwill occur during the construction phase. Masonry restoration work will be part of a forthcoming MOA and will beconsulted on in a future S106 consultation meeting. Masonry Restoration includes repairs or inkind replacementof damaged or missing stone and brick, and repointing and cleaning of the entire exterior of the building.

Danielle

Danielle Breaux

Project Manager Contractor

U.S. General Services Administration

Office of Planning & Design Quality

Tel 202.288.1298

Em [email protected]

2 attachments

44129 Underpinning Effort Diagram Final.png358K

040120 maintenance of unit masonry.pdf200K

mailto:[email protected]

tel:202.288.1298

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NOT FOR CONSTRUCTION

Contract # GS-11P-14-MM-C-0011

St. Elizabeths West Campus DRAFT June, 15, 2015

Center Building 040120 - 1 MAINTENANCE OF UNIT MASONRY

SENSITIVE BUT UNCLASSIFIED (SBU)

PROPERTY OF THE UNITED STATES GOVERNMENT – FOR OFFICIAL USE ONLY

Do not remove this notice. Properly destroy documents when no longer needed.

SECTION 040120 - MAINTENANCE OF UNIT MASONRY

PART 1 - GENERAL

1.1 RELATED DOCUMENTS

A. Drawings and general provisions of the Contract, including General and Supplementary

Conditions and Division 01 Specification Sections, apply to this Section.

1.2 SUMMARY

A. Section includes, but is not limited to, maintenance of unit masonry consisting of brick clay

masonry restoration and cleaning as follows:

1. Selective demolition of masonry assemblies as indicated on the Drawings.

2. Unused anchor removal.

3. Removal of miscellaneous metals attached to unit masonry, including, but not limited to,

conduits, lights, downspouts, and signage.

4. Repairing unit masonry, including replacing units.

5. Salvage of existing units for reinstallation.

6. Painting steel uncovered during the work.

7. Reanchoring veneers.

8. Repointing joints.

9. Preliminary cleaning, including removing plant growth.

10. Cleaning exposed unit masonry surfaces.

B. Related Sections:

1. Division 01 Section "Historic Treatment Procedures."

2. Division 04 Section "Maintenance of Stone Assemblies."

3. Division 04 Section "Unit Masonry" for new clay masonry construction.

4. Division 07 Section "Sheet Metal Flashing and Trim" for metal flashing installed in or on

restored clay masonry.

5. Division 07 Section “Joint Sealants”.

C. Special Considerations:

1. Existing brick masonry has been tested in accordance with ASTM C 67. Results of

testing will be made available to Contractor.

2. Existing masonry has been exposed to environmental conditions that have permitted it to

be saturated with moisture. It will be the responsibility of the Masonry Restoration and

Cleaning Contractor to determine the final procedures and schedule required to “dry out”

existing masonry walls, repair, replace and repoint all masonry and then clean all walls of

any discolorations, leaching, efflorescence, and other deleterious effects from exposure,

new work performed, weather enclosure of the building and final conditioning of








building. Coordinate this work with demolition contractor as well as other trades whose

work involves contact with or around existing masonry walls.

1.3 DEFINITIONS

A. Very Low-Pressure Spray: Under 100 psi (690 kPa).

B. Low-Pressure Spray: 100 to 400 psi (690 to 2750 kPa); 4 to 6 gpm (0.25 to 0.4 L/s).

C. Medium-Pressure Spray: 400 to 800 psi (2750 to 5510 kPa); 4 to 6 gpm (0.25 to 0.4 L/s).

D. High-Pressure Spray: 800 to 1200 psi (5510 to 8250 kPa); 4 to 6 gpm (0.25 to 0.4 L/s).

E. Saturation Coefficient: Ratio of the weight of water absorbed during immersion in cold water

to weight absorbed during immersion in boiling water; used as an indication of resistance of

masonry units to freezing and thawing.

1.4 PRECONSTRUCTION TESTING

A. Preconstruction Testing Service: Engage a qualified testing agency to perform preconstruction

testing on masonry units as follows.

1. Provide test specimens as indicated and representative of proposed materials and

construction.

2. Existing Mortar: Test according to ASTM C 295, modified as agreed by testing service

and Contracting Officer for Project requirements, to determine proportional composition

of original ingredients, sizes and colors of aggregates, and approximate strength. Use X-

ray diffraction, infrared spectroscopy, and differential thermal analysis as necessary to

supplement microscopical methods. Carefully remove existing mortar from within joints

at twelve locations designated by Contracting Officer.

3. Temporary Patch: As directed by Contracting Officer, provide temporary materials at

locations from which existing samples were taken.

4. Replacement Brick: Test each proposed type of replacement masonry unit, according to

sampling and testing methods in ASTM C 67 for compressive strength, 24-hour cold-

water absorption, 5-hour boil absorption, saturation coefficient, and initial rate of

absorption (suction). Replacement brick shall at a minimum perform/test equal to existing

units and may perform at a higher level if not detrimental to overall wall assembly.

1.5 LEED FOCUS MATERIALS

A. LEED Focus Materials (LFMs) for this Section:

1. All field-applied adhesives, sealants, paints, and coatings used in interior applications

2. Unit Masonry

3. Mortar








1.6 ACTION SUBMITTALS

A. Product Data: For each type of product indicated. Include recommendations for application

and use. Include test data substantiating that products comply with requirements.

B. LEED Submittals

1. A completed LEED Reporting Form (LRF) with a separate line item completed for each

LEED Focus Materials (LFM).

2. Cut Sheets: Product cut sheets for each LFM confirming that the submitted products are

the products installed as part of the Work.

3. Validation: Provide validation for each LFM according to the Action Submittals

requirements of Division 01 Section “Sustainable Design and Construction.”

a. VOC Content

b. Regional Materials Content (unit masonry and mortar only)

C. Shop Drawings: For the following:

1. Full-size patterns with complete dimensions for new specially molded brick shapes and

brick arches and their jointing, showing relation of existing to new units.

2. Provisions for expansion joints or other sealant joints.

3. Provisions for flashing, lighting fixtures, conduits, and weep holes as required.

4. Replacement and repair anchors. Include details of anchors within individual masonry

units, with locations of anchors and dimensions of holes and recesses in units required for

anchors.

D. Samples for Verification: For the following:

1. Each type of masonry unit to be used for replacing existing units. Include sets of

Samples as necessary to show the full range of shape, color, and texture to be expected.

a. For each brick type, provide straps or panels containing at least four bricks.

Include multiple straps for brick with a wide range.

2. Each type of sand used for pointing mortar; minimum 1 lb (0.5 kg) of each in plastic

screw-top jars.

a. For blended sands, provide Samples of each component and blend.

b. Identify sources, both supplier and quarry, of each type of sand.

3. Each type, color, and texture of pointing mortar in the form of sample mortar strips, 6

inches (150 mm) long by 1/2 inch (13 mm) wide, set in aluminum or plastic channels.

a. Include with each Sample a list of ingredients with proportions of each. Identify

sources, both supplier and quarry, of each type of sand and brand names of

cementitious materials and pigments if any.

4. Sealant Materials: See Division 07 Section "Joint Sealants."

5. Accessories: Each type of anchor, accessory, and miscellaneous support.








1.7 INFORMATIONAL SUBMITTALS

A. Qualification Data: For restoration specialists including field supervisors and restoration

workers, chemical-cleaner manufacturer, and testing service.

B. Preconstruction Test Reports: For existing and replacement masonry units.

C. Quality-Control Program.

D. Restoration Program.

E. Cleaning Program.

1.8 QUALITY ASSURANCE

A. General: Refer to requirements of Division 00 Section “Competency of Specialist for Masonry

Restoration: Technical Qualifications ” for specific competency and technical qualification data

to be submitted to the Contracting Officer on the Technical Qualifications Data Forms provided

as part of the Bidding Process.

B. Restoration Specialist Qualifications: Engage an experienced masonry restoration and cleaning

firm to perform work of this Section. Firm shall have completed work similar in material,

design, and extent to that indicated for this Project with a record of successful in-service

performance. Experience installing standard unit masonry is not sufficient experience for

masonry restoration work.

1. At Contractor's option, work may be divided between two specialist firms: one for

cleaning work and one for repair work.

2. Field Supervision: Restoration specialist firms shall maintain experienced full-time

supervisors on Project site during times that clay masonry restoration and cleaning work

is in progress. Supervisors shall not be changed during Project except for causes beyond

the control of restoration specialist firm.

3. Restoration Worker Qualifications: Persons who are experienced and specialize in

restoration work of types they will be performing.

C. Chemical-Cleaner Manufacturer Qualifications: A firm regularly engaged in producing

masonry cleaners that have been used for similar applications with successful results, and with

factory-trained representatives who are available for consultation and Project-site inspection and

assistance at no additional cost.

D. Source Limitations: Obtain each type of material for masonry restoration (face brick, cement,

sand, etc.) from one source with resources to provide materials of consistent quality in

appearance and physical properties.

E. Quality-Control Program: Prepare a written quality-control program for this Project to

systematically demonstrate the ability of personnel to properly follow methods and use

materials and tools without damaging masonry. Include provisions for supervising performance

and preventing damage due to worker fatigue.








F. Restoration Program: Prepare a written, detailed description of materials, methods, equipment,

and sequence of operations to be used for each phase of restoration work including protection of

surrounding materials and Project site.

1. Include methods for keeping pointing mortar damp during curing period.

2. If materials and methods other than those indicated are proposed for any phase of

restoration work, add to the Quality-Control Program a written description of such

materials and methods, including evidence of successful use on comparable projects, and

demonstrations to show their effectiveness for this Project and worker's ability to use

such materials and methods properly.

G. Cleaning Program: Prepare a written cleaning program that describes cleaning process in detail,

including materials, methods, and equipment to be used, protection of surrounding materials,

and control of runoff during operations.

1. If materials and methods other than those indicated are proposed for any phase of

restoration work, add to the Quality-Control Program a written description of such

materials and methods, including evidence of successful use on comparable projects, and

demonstrations to show their effectiveness for this Project and worker's ability to use

such materials and methods properly.

H. Cleaning and Repair Appearance Standard: Cleaned and repaired surfaces are to have a

uniform appearance as viewed from 20 feet (6 m) away by Contracting Officer. Perform

additional paint and stain removal, general cleaning, and spot cleaning of small areas that are

noticeably different, so that surface blends smoothly into surrounding areas.

I. Mockups: Prepare mockups of restoration and cleaning to demonstrate aesthetic effects and set

quality standards for materials and execution and for fabrication and installation.

1. Masonry Repair: Prepare sample areas for each type of masonry material indicated to

have repair work performed. If not otherwise indicated, size each mockup not smaller

than approximately 48 inches (1200 mm) in each dimension. Erect sample areas in

existing walls unless otherwise indicated, to demonstrate quality of materials,

workmanship, and blending with existing work. Include the following as a minimum:

a. Contractor to note that only salvaged brick shall be use at areas designated as BR2

on drawings. At BR3 and BR4 areas only use replacement brick when no salvage

brick is available.

b. Reanchoring Veneers: Install three masonry repair anchors in mockup wall

assembly of each anchor type required.

2. Repointing: Rake out joints in 2 separate areas, each approximately 36 inches (900 mm)

high by 48 inches (1200 mm) wide for each type of repointing required and repoint one

of the areas.

3. Cleaning: Clean an area approximately 25 sq. ft. (2.3 sq. m) for each type of masonry

and surface condition.

a. Test cleaners and methods on samples of adjacent materials for possible adverse

reactions. Do not use cleaners and methods known to have deleterious effect.

b. Perform final cleaning procedures on portion of repointing mock-up.

c. Allow a waiting period of not less than seven days after completion of sample

cleaning to permit a study of sample panels for negative reactions.








4. Approval of mockups does not constitute approval of deviations from the Contract

Documents contained in mockups unless Contracting Officer specifically approves such

deviations in writing.

J. Preinstallation Conference: Conduct conference at Project site.

1. Review methods and procedures related to masonry restoration and cleaning including,

but not limited to, the following:

a. Construction schedule. Verify availability of materials, Restoration Specialist's

personnel, equipment, and facilities needed to make progress and avoid delays.

b. Materials, material application, sequencing, tolerances, and required clearances.

K. LEED Quality Assurance

1. Meet the VOC limitations for adhesives, sealants, paints, and coatings as defined in

Division 01 Section “Volatile Organic Compound Limits”.

2. Minimum Recycled Content defined in Division 01 Section “Sustainable Design

Requirements”. Report Recycled Content only. No minimum requirement.

3. Regional Content defined in Division 01 “Sustainable Design Requirements”. Report

Regional Content only. No minimum requirement.

4. VOC content limitations defined in Division 01 Section “Volatile Organic Compound

Limits”.

1.9 DELIVERY, STORAGE, AND HANDLING

A. Deliver masonry units to Project site strapped together in suitable packs or pallets or in heavy-

duty cartons.

B. Deliver other materials to Project site in manufacturer's original and unopened containers,

labeled with manufacturer's name and type of products.

C. Store cementitious materials on elevated platforms, under cover, and in a dry location. Do not

use cementitious materials that have become damp.

D. Store hydrated lime in manufacturer's original and unopened containers. Discard lime if

containers have been damaged or have been opened for more than two days.

E. Store lime putty covered with water in sealed containers.

F. Store sand where grading and other required characteristics can be maintained and

contamination avoided.








1.10 PROJECT CONDITIONS

A. Weather Limitations: Proceed with installation only when existing and forecasted weather

conditions permit masonry restoration and cleaning work to be performed according to

manufacturers' written instructions and specified requirements.

B. Cold-Weather Requirements: Comply with the following procedures for masonry repair and

mortar-joint pointing unless otherwise indicated:

1. When air temperature is below 40 deg F (4 deg C), heat mortar ingredients, masonry

repair materials, and existing masonry walls to produce temperatures between 40 and 120

deg F (4 and 49 deg C).

2. When mean daily air temperature is below 40 deg F (4 deg C), provide enclosure and

heat to maintain temperatures above 32 deg F (0 deg C) within the enclosure for 7 days

after repair and pointing.

C. Hot-Weather Requirements: Protect masonry repair and mortar-joint pointing when

temperature and humidity conditions produce excessive evaporation of water from mortar and

repair materials. Provide artificial shade and wind breaks and use cooled materials as required

to minimize evaporation. Do not apply mortar to substrates with temperatures of 90 deg F (32

deg C) and above unless otherwise indicated.

D. For manufactured repair materials, perform work within the environmental limits set by each

manufacturer.

E. Clean masonry surfaces only when air temperature is 40 deg F (4 deg C) and above and is

predicted to remain so for at least 7 days after completion of cleaning.

1.11 SEQUENCING AND SCHEDULING

A. Order replacement materials at earliest possible date to avoid delaying completion of the Work.

B. Order materials for pointing mortar immediately after approval of mockups. Take delivery of

and store at Project site a sufficient quantity to complete Project.

C. Perform masonry restoration work in the following sequence:

1. Remove plant growth.

2. Clean for soiling and all major staining, including paint removal.

3. Take samples of cleaned historic mortar for matching purposes.

4. Perform all repairs.

5. Rake out mortar from joints surrounding masonry to be replaced and from joints adjacent

to masonry repairs along joints.

6. Repair masonry, including replacing existing masonry with primarily salvaged materials.

7. Rake out mortar from joints to be repointed.

8. Point mortar joints.

9. Inspect for open mortar joints and repair before cleaning to prevent the intrusion of water

and other cleaning materials into the wall.








10. Protect all adjacent or adjoining surfaces including, but not limited to, windows and

associated trim, cast iron ornaments, copper flashings, gutters and downspouts, etc., from

cleaning materials.

11. Perform final cleaning with mild detergent.

D. As scaffolding is removed, remove masonry units containing anchors and replace with new

units to match existing masonry. Patch holes in mortar joints to comply with "Repointing

Masonry" Article.

PART 2 - PRODUCTS

2.1 MASONRY MATERIALS

A. Face Brick – Types BR-3 and BR-4:

1. Provide face brick, including specially molded, ground, cut, or sawed shapes where

required to complete masonry restoration work.

2. Provide units with colors, color variation within units, surface texture, size, and shape to

match existing brickwork.

a. For existing brickwork that exhibits a range of colors or color variation within

units, provide brick that proportionally matches that range and variation rather than

brick that matches an individual color within that range.

3. Special Shapes:

a. Provide specially molded, 100 percent solid shapes for applications where core

holes or "frogs" could be exposed to view or weather when in final position and

where shapes produced by sawing would result in sawed surfaces being exposed to

view.

b. Provide specially ground units, shaped to match patterns, for arches and where

indicated.

c. Mechanical chopping or breaking brick, or bonding pieces of brick together by

adhesive, are not acceptable procedures for fabricating special shapes.

4. Tolerances as Fabricated: Comply with tolerance requirements in ASTM C 216,

Type FBX.

5. Date Identification: Emboss in the clay body on an interior surface of each unit in easily

read 1/2-inch- (13-mm-) high characters, "MADE <Insert year>." Manufacturer's name

may also be embossed.

B. Building Brick: Provide building brick complying with ASTM C 62, of same vertical

dimension as face brick, for masonry work concealed from view.

1. Grade SW where in contact with earth.

2. Grade SW, MW, or NW for concealed backup.

3. Date Identification: Emboss in the clay body on an interior surface of each unit in easily

read 1/2-inch- (13-mm-) high characters, "MADE <Insert year>." Manufacturer's name

may also be embossed.

C. Salvaged Brick – Type BR2:

1. Obtain salvaged brick from locations shown on Drawings. Clean off residual mortar.








2. Use salvaged brick at locations noted BR2 on Drawings. Use salvaged in other locations

as well, until no salvaged brick remains.

3. Provide replacement brick once all salvaged brick has been used.

2.2 MORTAR MATERIALS

A. Portland Cement: ASTM C 150, Type I or Type II, white or gray or both where required for

color matching of exposed mortar.

1. Provide cement containing not more than 0.60 percent total alkali when tested according

to ASTM C 114.

B. Hydrated Lime: ASTM C 207, Type S.

C. Mortar Sand: ASTM C 144 unless otherwise indicated.

1. Color: Provide natural sand or ground marble, granite, or other sound stone of color

necessary to produce required mortar color.

2. For pointing mortar, provide sand with rounded edges.

3. Match size, texture, and gradation of existing mortar sand as closely as possible. Blend

several sands if necessary to achieve suitable match.

D. Mortar Pigments: Natural and synthetic iron oxides, compounded for mortar mixes. Use only

pigments with a record of satisfactory performance in masonry mortars.

E. Water: Potable.

2.3 PAINT REMOVERS

A. General: For removal and disposal of lead containing paint see Division 02 Section “Control Of

Lead-Based Paint”.

B. Low-Odor, Solvent-Type Paint Remover: Manufacturer's standard low-odor, water-rinsable

solvent-type gel formulation, containing no methanol or methylene chloride, for removing paint

coatings from masonry.

1. Products: Subject to compliance with requirements, provide one of the following

a. ABR Products, Inc.; Super Bio Strip Gel.

b. Cathedral Stone Products, Inc.; S-301 S-303 or S-305.

c. Dumond Chemicals, Inc.; Peel Away 6, Peel Away 7 or Peel Away 21.

d. PROSOCO; Enviro Klean Safety Peel 1 or Enviro Klean Safety Peel 3.

2.4 CLEANING MATERIALS

A. Water: Potable.








B. Hot Water: Water heated to a temperature of 140 to 160 deg F (60 to 71 deg C).

C. Job-Mixed Detergent Solution: Solution prepared by mixing 2 cups (0.5 L) of tetrasodium

polyphosphate, 1/2 cup (125 mL) of laundry detergent, and 20 quarts (20 L) of hot water for

every 5 gal. (20 L) of solution required.

D. Job-Mixed Mold, Mildew, and Algae Remover: Solution prepared by mixing 2 cups (0.5 L) of

tetrasodium polyphosphate, 5 quarts (5 L) of 5 percent sodium hypochlorite (bleach), and 15

quarts (15 L) of hot water for every 5 gal. (20 L) of solution required.

E. Nonacidic Gel Cleaner: Manufacturer's standard gel formulation, with pH between 6 and 9, that

contains detergents with chelating agents and is specifically formulated for cleaning masonry

surfaces.

1. Products: Subject to compliance with requirements, provide one of the following:

a. Price Research, Ltd.; Price Marble Cleaner-Gel.

b. PROSOCO; Sure Klean 942 Limestone and Marble Cleaner.

F. Nonacidic Liquid Cleaner: Manufacturer's standard mildly alkaline liquid cleaner formulated

for removing mold, mildew, and other organic soiling from ordinary building materials,

including polished stone, brick, aluminum, plastics, and wood.


a. Diedrich Technologies Inc.; Diedrich 910PM Polished Marble Cleaner.

b. Dominion Restoration Products, Inc.; Bio-Cleanse.

c. Dumond Chemicals, Inc.; Safe n' Easy Contracting Officerural Cleaner/Restorer.

d. Price Research, Ltd.; Price Non-Acid Masonry Cleaner.

e. PROSOCO; Enviro Klean 2010 All Surface Cleaner.

G. Mild Acidic Cleaner: Manufacturer's standard mildly acidic cleaner containing no muriatic

(hydrochloric), hydrofluoric, or sulfuric acid; or ammonium bifluoride or chlorine bleaches.

1. Products: Subject to compliance with requirements, provide one of the following

a. ABR Products, Inc.; X-190 Limestone & Concrete Cleaner.

b. Diedrich Technologies Inc.; Envirorestore 100.

c. Dominion Restoration Products, Inc.; DR-60 Stone and Masonry Cleaner.

d. PROSOCO; Enviro Klean BioWash.

H. Acidic Cleaner: Manufacturer's standard acidic masonry cleaner composed of hydrofluoric acid

or ammonium bifluoride blended with other acids, detergents, wetting agents, and inhibitors.


a. ABR Products, Inc.; 801 Heavy Duty Masonry Cleaner.

b. Diedrich Technologies Inc.; Diedrich 101 Masonry Restorer or Diedrich

101G Granite, Terra Cotta, and Brick Cleaner.








c. Dumond Chemicals, Inc.; Safe n' Easy Ultimate Stone and Masonry Cleaner or

Safe n' Easy Heavy Duty Restoration Cleaner.

d. Hydroclean, Hydrochemical Techniques, Inc.; Hydroclean Brick, Granite,

Sandstone and Terra Cotta Cleaner (HT-626).

e. Price Research, Ltd.; Price Heavy Duty Restoration Cleaner or Price Restoration

Cleaner.

f. PROSOCO; Enviro Klean Restoration Cleaner, Sure Klean Restoration Cleaner or

Sure Klean Heavy-Duty Restoration Cleaner.

2.5 ACCESSORY MATERIALS

A. Liquid Strippable Masking Agent: Manufacturer's standard liquid, film-forming, strippable

masking material for protecting glass, metal, and polished stone surfaces from damaging effects

of acidic and alkaline masonry cleaners.


a. ABR Products, Inc.; Rubber Mask.

b. Price Research, Ltd.; Price Mask.

c. PROSOCO; Sure Klean Strippable Masking.

B. Masonry Repair Anchors, Expansion Type: Mechanical fasteners designed for masonry veneer

stabilization consisting of 1/4-inch- (6-mm-) diameter, Type 316 stainless-steel rod with brass

expanding shells at each end and water-shedding washer in the middle. Expanding shells shall

be designed to provide positive mechanical anchorage to veneer on one end and backup

masonry on the other.


a. BLOK-LOK Limited; Torq-Lok.

b. Dur-O-Wal, a division of Dayton Superior; Dur-O-Wal Repair Anchor.

c. Hohmann & Barnard, Inc.; #521RA-B Restoration Anchor.

C. Masonry Repair Anchors, Spiral Type: Type 316 stainless-steel spiral rods designed to anchor

to backing and veneer. Anchors are flexible in plane of veneer but rigid perpendicular to it.

1. Provide driven-in anchors designed to be installed in drilled holes and relying on screw

effect rather than adhesive to secure them to backup and veneer.


a. BLOK-LOK Limited; Spira-Lok.

b. Dur-O-Wal, a division of Dayton Superior; Dur-O-Pair Resin Anchor or Dur-O-

Flex Friction Pin Anchor.

c. Heckmann Building Products Inc.; #391 Remedial Tie.

d. Hohmann & Barnard, Inc.; Helix Spiro-Ties.

D. Setting Buttons: Resilient plastic buttons, nonstaining to masonry, sized to suit joint

thicknesses and bed depths of masonry units without intruding into required depths of pointing

materials.








E. Masking Tape: Nonstaining, nonabsorbent material, compatible with pointing mortar, joint

primers, sealants, and surfaces adjacent to joints; that will easily come off entirely, including

adhesive.

F. Antirust Coating: Refer to Division 09 Section “Exterior Painting”.

G. Miscellaneous Products: Select materials and methods of use based on the following, subject to

approval of a mockup:

1. Previous effectiveness in performing the work involved.

2. Little possibility of damaging exposed surfaces.

3. Consistency of each application.

4. Uniformity of the resulting overall appearance.

5. Do not use products or tools that could do the following:

a. Remove, alter, or in any way harm the present condition or future preservation of

existing surfaces, including surrounding surfaces not in contract.

b. Leave a residue on surfaces.

2.6 MORTAR MIXES

A. Measurement and Mixing: Measure cementitious materials and sand in a dry condition by

volume or equivalent weight. Do not measure by shovel; use known measure. Mix materials in

a clean, mechanical batch mixer.

1. Mixing Pointing Mortar: Thoroughly mix cementitious materials and sand together

before adding any water. Then mix again adding only enough water to produce a damp,

unworkable mix that will retain its form when pressed into a ball. Maintain mortar in this

dampened condition for 15 to 30 minutes. Add remaining water in small portions until

mortar reaches desired consistency. Use mortar within one hour of final mixing; do not

retemper or use partially hardened material.

B. Colored Mortar: Produce mortar of color required by using specified ingredients. Do not alter

specified proportions without Contracting Officer's approval.

1. Mortar Pigments: Where mortar pigments are indicated, do not exceed a pigment-to-

cement ratio of 1:10 by weight.

C. Do not use admixtures in mortar unless otherwise indicated.

D. Mortar Proportions: Mix mortar materials in the following proportions:

1. Pointing Mortar for Brick: Type O.

a. 1 part cement, 3 parts lime, and 10 parts sand.

b. Add mortar pigments to produce mortar colors required.








2. Rebuilding (Setting) Mortar: Same as pointing mortar except mortar pigments are not

required.

2.7 CHEMICAL CLEANING SOLUTIONS

A. General: Chemical cleaner shall only be used after all non-chemical cleaners have been

applied.

B. Dilute chemical cleaners with water to produce solutions not exceeding concentration

recommended by chemical-cleaner manufacturer.

C. Acidic Cleaner Solution for brick: Dilute with water to produce hydrofluoric acid content of 3

percent or less, but not greater than that recommended by chemical-cleaner manufacturer.

PART 3 - EXECUTION

3.1 PROTECTION

A. Protect persons, motor vehicles, surrounding surfaces of building being restored, building site,

plants, and surrounding buildings from harm resulting from masonry restoration work.

1. Erect temporary protective covers over walkways and at points of pedestrian and

vehicular entrance and exit that must remain in service during course of restoration and

cleaning work.

B. Comply with chemical-cleaner manufacturer's written instructions for protecting building and

other surfaces against damage from exposure to its products. Prevent chemical-cleaning

solutions from coming into contact with people, motor vehicles, landscaping, buildings, and

other surfaces that could be harmed by such contact.

1. Perform chemical cleaning processes prior to repointing.

2. Cover adjacent surfaces with materials that are proven to resist chemical cleaners used

unless chemical cleaners being used will not damage adjacent surfaces. Use materials

that contain only waterproof, UV-resistant adhesives. Apply masking agents to comply

with manufacturer's written instructions. Do not apply liquid masking agent to painted or

porous surfaces. When no longer needed, promptly remove masking to prevent adhesive

staining.

3. Keep wall wet below area being cleaned to prevent streaking from runoff.

4. Do not clean masonry during winds of sufficient force to spread cleaning solutions to

unprotected surfaces.

5. Neutralize and collect alkaline and acid wastes for disposal off Government's property.

6. Dispose of runoff from cleaning operations by legal means and in a manner that prevents

soil erosion, undermining of paving and foundations, damage to landscaping, and water

penetration into building interiors.

C. Prevent mortar from staining face of surrounding masonry and other surfaces.








1. Cover sills, ledges, and projections to protect from mortar droppings.

2. Keep wall area wet below rebuilding and pointing work to discourage mortar from

adhering.

3. Immediately remove mortar in contact with exposed masonry and other surfaces.

4. Clean mortar splatters from scaffolding at end of each day.

D. Remove gutters and downspouts adjacent to masonry and store during masonry restoration and

cleaning. Reinstall when masonry restoration and cleaning are complete. Coordinate

installation of new gutters and downspouts to occur after masonry restoration and cleaning are

complete.

1. Provide temporary rain drainage during workto direct water away from building.

3.2 UNUSED ANCHOR REMOVAL

A. Remove masonry anchors, brackets, wood nailers, and other extraneous items no longer in use

unless identified as historically significant or indicated to remain.

1. Remove items carefully to avoid spalling or cracking masonry.

2. Where directed, if an item cannot be removed without damaging surrounding masonry,

remove entire masonry unit and replace with new unit to match existing.

3.3 BRICK REMOVAL AND REPLACEMENT

A. General: Sort and label face brick and back-up brick separately.

B. At locations indicated, remove bricks that are damaged, spalled, or deteriorated or are to be

reused. Carefully demolish or remove entire units from joint to joint, without damaging

surrounding masonry, in a manner that permits replacement with full-size units.

1. When removing single bricks, remove material from center of brick and work toward

outside edges.

2. Salvage as many existing bricks as possible for reinstallation.

C. Support and protect remaining masonry that surrounds removal area. Maintain flashing,

reinforcement, lintels, and adjoining construction in an undamaged condition.

D. Notify Contracting Officer of unforeseen detrimental conditions including voids, cracks, bulges,

and loose units in existing masonry backup, rotted wood, rusted metal, and other deteriorated

items.

E. Remove in an undamaged condition as many whole bricks as possible.

1. Remove mortar, loose particles, and soil from brick by cleaning with hand chisels,

brushes, and water.

2. Remove sealants by cutting close to brick with utility knife and cleaning with solvents.

3. Store brick for reuse. Store off ground, on skids, and protected from weather.








4. Deliver cleaned brick not required for reuse to Government unless otherwise indicated.

F. Clean bricks surrounding removal areas by removing mortar, dust, and loose particles in

preparation for replacement.

G. Replace removed damaged brick with other removed brick in good quality, where possible, or

with new brick matching existing brick, including size. Do not use broken units unless they can

be cut to usable size.

H. Install replacement brick into bonding and coursing pattern of existing brick. If cutting is

required, use a motor-driven saw designed to cut masonry with clean, sharp, unchipped edges.

1. Maintain joint width for replacement units to match existing joints.

2. Use setting buttons or shims to set units accurately spaced with uniform joints.

I. Lay replacement brick with completely filled bed, head, and collar joints. Butter ends with

sufficient mortar to fill head joints and shove into place. Wet both replacement and surrounding

bricks that have ASTM C 67 initial rates of absorption (suction) of more than 30 g/30 sq. in. per

min. (30 g/194 sq. cm per min.). Use wetting methods that ensure that units are nearly saturated

but surface is dry when laid.

1. Rake out mortar used for laying brick before mortar sets and point new mortar joints in

repaired area to comply with requirements for repointing existing masonry, and at same

time as repointing of surrounding area.

2. When mortar is sufficiently hard to support units, remove shims and other devices

interfering with pointing of joints.

3.4 REANCHORING VENEERS

A. Install masonry repair anchors in horizontal mortar joints and according to manufacturer's

written instructions. Install at not more than 16 inches (400 mm) o.c. vertically and 32 inches

(800 mm) o.c. horizontally unless otherwise indicated. Install at locations to avoid penetrating

flashing.

B. Recess anchors at least 5/8 inch (16 mm) from surface of mortar joint and fill recess with

pointing mortar.

3.5 PAINTING STEEL UNCOVERED DURING THE WORK

A. Inspect steel exposed during masonry removal. Where Contracting Officer determines that it is

structural, or for other reasons cannot be totally removed, prepare and paint it as follows:

1. Remove paint, rust, and other contaminants according to SSPC-SP 2, "Hand Tool

Cleaning" or “SSPC-SP 3, "Power Tool Cleaning", as applicable to meet paint

manufacturer's recommended preparation.








2. Immediately paint exposed steel with two coats of antirust coating, following coating

manufacturer's written instructions and without exceeding manufacturer's recommended

rate of application (dry film thickness per coat).

B. If on inspection and rust removal, the cross section of a steel member is found to be reduced

from rust by more than 1/16 inch (1.6 mm), notify Contracting Officer before proceeding.

3.6 CLEANING MASONRY, GENERAL

A. Proceed with cleaning in an orderly manner; work from top to bottom each scaffold width and

from one end of each elevation to the other. Ensure that dirty residues and rinse water will not

wash over cleaned, dry surfaces.

B. Use cleaning methods in order of least abrasive to most abrasive, multiple passes may be

required.

1. Do not use wire brushes or brushes that are not resistant to chemical cleaner being used.

Do not use plastic-bristle brushes if natural-fiber brushes will resist chemical cleaner

being used.

2. Use spray equipment that provides controlled application at volume and pressure

indicated, measured at spray tip. Adjust pressure and volume to ensure that cleaning

methods do not damage masonry.

a. Equip units with pressure gages.

3. For chemical-cleaner spray application, use low-pressure tank or chemical pump suitable

for chemical cleaner indicated, equipped with cone-shaped spray tip.

4. For water-spray application, use fan-shaped spray tip that disperses water at an angle of

25 to 50 degrees.

5. For high-pressure water-spray application, use fan-shaped spray tip that disperses water

at an angle of at least 40 degrees.

6. For heated water-spray application, use equipment capable of maintaining temperature

between 140 and 160 deg F (60 and 71 deg C) at flow rates indicated.

7. For steam application, use steam generator capable of delivering live steam at nozzle.

C. Perform each cleaning method indicated in a manner that results in uniform coverage of all

surfaces, including corners, moldings, and interstices, and that produces an even effect without

streaking or damaging masonry surfaces.

D. Water Application Methods:

1. Water-Soak Application: Soak masonry surfaces by applying water continuously and

uniformly to limited area for time indicated. Apply water at low pressures and low

volumes in multiple fine sprays using perforated hoses or multiple spray nozzles. Erect a

protective enclosure constructed of polyethylene sheeting to cover area being sprayed.

2. Water-Spray Applications: Unless otherwise indicated, hold spray nozzle at least 6

inches (150 mm) from surface of masonry and apply water in horizontal back and forth

sweeping motion, overlapping previous strokes to produce uniform coverage.








E. Steam Cleaning: Apply steam to masonry surfaces at the very low pressures indicated for each

type of masonry material. Hold nozzle at least 6 inches (150 mm) from surface of masonry and

apply steam in horizontal back and forth sweeping motion, overlapping previous strokes to

produce uniform coverage.

F. Chemical-Cleaner Application Methods: Apply chemical cleaners to masonry surfaces to

comply with chemical-cleaner manufacturer's written instructions; use brush or spray

application. Do not spray apply at pressures exceeding 50 psi (345 kPa). Do not allow

chemicals to remain on surface for periods longer than those indicated or recommended by

manufacturer.

G. Rinse off chemical residue and soil by working upward from bottom to top of each treated area

at each stage or scaffold setting. Periodically during each rinse, test pH of rinse water running

off of cleaned area to determine that chemical cleaner is completely removed.

1. Apply neutralizing agent and repeat rinse if necessary to produce tested pH of between

6.7 and 7.5.

H. After cleaning is complete, remove protection no longer required. Remove tape and adhesive

marks.

3.7 PRELIMINARY CLEANING

A. Removing Plant Growth: Completely remove visible plant, moss, and shrub growth from

masonry surfaces. Carefully remove plants, creepers, and vegetation by cutting at roots and

allowing to dry as long as possible before removal. Remove loose soil and debris from open

masonry joints to whatever depth they occur.

B. Preliminary Cleaning: Before beginning general cleaning, remove extraneous substances that

are resistant to cleaning methods being used. Extraneous substances include paint, calking,

asphalt, and tar.

1. Carefully remove heavy accumulations of material from surface of masonry with a sharp

chisel. Do not scratch or chip masonry surface.

2. Remove paint and calking with alkaline paint remover.

a. Comply with requirements in "Paint Removal" Article.

b. Repeat application up to two times if needed.

3. Remove asphalt and tar with solvent-type paint remover.

a. Comply with requirements in "Paint Removal" Article.

b. Apply paint remover only to asphalt and tar by brush without prewetting.

c. Allow paint remover to remain on surface for 10 to 30 minutes.

d. Repeat application if needed.








3.8 PAINT REMOVAL

A. Paint Removal with Alkaline Paste Paint Remover:

1. Remove loose and peeling paint using low to medium pressure spray, scrapers, stiff

brushes, or a combination of these. Let surface dry thoroughly.

2. Apply paint remover to dry, painted masonry with brushes.

3. Allow paint remover to remain on surface for period recommended by manufacturer.

4. Rinse with hot water applied by low to medium pressure spray to remove chemicals and

paint residue.

5. Repeat process if necessary to remove all paint.

6. Apply acidic cleaner or manufacturer's recommended afterwash to masonry, while

surface is still wet, using low-pressure spray equipment or soft-fiber brush. Let cleaner

or afterwash remain on surface as a neutralizing agent for period recommended by

chemical cleaner or afterwash manufacturer.

7. Rinse with cold water applied bylow to medium pressure spray to remove chemicals and

soil.

B. Paint Removal with Covered or Skin-Forming Alkaline Paint Remover:

1. Remove loose and peeling paint using medium pressure spray, scrapers, stiff brushes, or a

combination of these. Let surface dry thoroughly.

2. Apply paint remover to dry, painted masonry with trowel, spatula, or as recommended by

manufacturer.

3. Apply cover, if required by manufacturer, per manufacturer's written instructions.

4. Allow paint remover to remain on surface for period recommended by manufacturer or as

determined in test panels.

5. Scrape off paint and remover and collect for disposal.

6. Rinse with hot water applied by medium-pressure spray to remove chemicals and paint

residue.

7. Use alkaline paste paint remover, according to "Paint Removal with Alkaline Paste Paint

Remover" Paragraph, if necessary to remove remaining paint.

8. Apply acidic cleaner or manufacturer's recommended afterwash to masonry, while

surface is still wet, using low-pressure spray equipment or soft-fiber brush. Let cleaner

or afterwash remain on surface as a neutralizing agent for period recommended by

chemical-cleaner or afterwash manufacturer.

9. Rinse with cold water applied by medium-pressure spray to remove chemicals and soil.

C. Paint Removal with Solvent-Type Paint Remover:

1. Remove loose and peeling paint using medium pressure spray, scrapers, stiff brushes, or a

combination of these. Let surface dry thoroughly.

2. Apply thick coating of paint remover to painted masonry with natural-fiber cleaning

brush, deep-nap roller, or large paint brush.

3. Allow paint remover to remain on surface for period recommended by manufacturer.

Agitate periodically with stiff-fiber brush.

4. Rinse with cold water applied by medium-pressure spray to remove chemicals and paint

residue.








3.9 CLEANING BRICKWORK

A. Cold-Water Soak:

1. Apply cold water by intermittent spraying to keep surface moist.

2. Use perforated hoses or other means that will apply a fine water mist to entire surface

being cleaned.

3. Apply water in cycles with at least 30 minutes between cycles.

4. Continue spraying until surface encrustation has softened sufficiently to permit its

removal by water wash, as indicated by cleaning tests.

5. Remove soil and softened surface encrustation from masonry with cold water applied by

low-pressure spray.

B. Cold-Water Wash: Use cold water applied by low-pressure spray.

C. Hot-Water Wash: Use hot water applied by low-pressure spray.

D. Steam Cleaning: Apply steam at very low pressures not exceeding 30 psi (207 kPa). Remove

dirt softened by steam with wood scrapers, stiff-nylon or -fiber brushes, or cold-water wash, as

indicated by cleaning tests.

E. Detergent Cleaning:

1. Wet masonry with hot water applied by low-pressure spray.

2. Scrub masonry with detergent solution using medium-soft brushes until soil is thoroughly

dislodged and can be removed by rinsing. Use small brushes to remove soil from mortar

joints and crevices. Dip brush in solution often to ensure that adequate fresh detergent is

used and that masonry surface remains wet.

3. Rinse with hot water applied by low pressure spray to remove detergent solution and soil.

4. Repeat cleaning procedure above where required to produce cleaning effect established

by mockup.

F. Mold, Mildew, and Algae Removal:


2. Apply mold, mildew, and algae remover by brush.

3. Scrub masonry with medium-soft brushes until mold, mildew, and algae are thoroughly

dislodged and can be removed by rinsing. Use small brushes for mortar joints and

crevices. Dip brush in mold, mildew, and algae remover often to ensure that adequate

fresh cleaner is used and that masonry surface remains wet.

4. Rinse with hot water applied by low-pressure spray to remove mold, mildew, and algae

remover and soil.


by mockup.

G. Nonacidic Gel Chemical Cleaning:









2. Apply nonacidic gel cleaner in 1/8-inch (3-mm) thickness by brush, working into joints

and crevices. Apply quickly and do not brush out excessively so area will be uniformly

covered with fresh cleaner and dwell time will be uniform throughout area being cleaned.

3. Let cleaner remain on surface for period indicated below:

a. As established by mockup.

4. Remove bulk of nonacidic gel cleaner by squeegeeing into containers for disposal.

5. Rinse with hot water applied by low-pressure spray to remove chemicals and soil.


by mockup. Do not repeat more than once. If additional cleaning is required, use steam

cleaning.

H. Nonacidic Liquid Chemical Cleaning:


2. Apply cleaner to masonry by brush. Let cleaner remain on surface for period indicated

below:


3. Rinse with hot water applied by low pressure spray to remove chemicals and soil.


by mockup. Do not repeat more than once. If additional cleaning is required, use steam

cleaning.

I. Mild Acidic Chemical Cleaning:

1. Wet masonry with cold water applied by low-pressure spray.

2. Apply cleaner to masonry by brush or low-pressure spray. Let cleaner remain on surface

for period indicated below:


3. Rinse with cold water applied by low-pressure spray to remove chemicals and soil.


by mockup. Do not repeat more than once. If additional cleaning is required, use a steam

cleaning.

3.10 REPOINTING MASONRY

A. Rake out and repoint all masonry joints according to procedures demonstrated in approved

mockup:

1. Remove mortar from joints to depth of 2 times joint width, but not less than 1/2 inch (13

mm) or not less than that required to expose sound, unweathered mortar.

2. Remove mortar from masonry surfaces within raked-out joints to provide reveals with

square backs and to expose masonry for contact with pointing mortar. Brush, vacuum, or

flush joints to remove dirt and loose debris.

3. Do not spall edges of masonry units or widen joints. Replace or patch damaged masonry

units as directed by Contracting Officer.








a. Cut out mortar by hand with chisel and resilient mallet. Do not use power-

operated grinders without Contracting Officer's written approval based on

approved quality-control program.

B. Notify Contracting Officer of unforeseen detrimental conditions including voids in mortar

joints, cracks, loose masonry units, rotted wood, rusted metal, and other deteriorated items.

C. Pointing with Mortar:

1. Rinse joint surfaces with water to remove dust and mortar particles. Time rinsing

application so, at time of pointing, joint surfaces are damp but free of standing water. If

rinse water dries, dampen joint surfaces before pointing.

2. Apply pointing mortar first to areas where existing mortar was removed to depths greater

than surrounding areas. Apply in layers not greater than 3/8 inch (9 mm) until a uniform

depth is formed. Fully compact each layer thoroughly and allow it to become thumbprint

hard before applying next layer.

3. After low areas have been filled to same depth as remaining joints, point all joints by

placing mortar in layers not greater than 3/8 inch (9 mm). Fully compact each layer and

allow to become thumbprint hard before applying next layer. Where existing masonry

units have worn or rounded edges, slightly recess finished mortar surface below face of

masonry to avoid widened joint faces. Take care not to spread mortar beyond joint edges

onto exposed masonry surfaces or to featheredge the mortar.

4. When mortar is thumbprint hard, tool joints to match original appearance of joints as

demonstrated in approved mockup. Remove excess mortar from edge of joint by

brushing.

5. Cure mortar by maintaining in thoroughly damp condition for at least 72 consecutive

hours including weekends and holidays.

a. Acceptable curing methods include covering with wet burlap and plastic sheeting,

periodic hand misting, and periodic mist spraying using system of pipes, mist

heads, and timers.

b. Adjust curing methods to ensure that pointing mortar is damp throughout its depth

without eroding surface mortar.

6. Hairline cracking within the mortar or mortar separation at edge of a joint is

unacceptable. Completely remove such mortar and repoint.

D. Where repointing work precedes cleaning of existing masonry, allow mortar to harden at least

30 days before beginning cleaning work.

3.11 FINAL CLEANING

A. After mortar has fully hardened, thoroughly clean exposed masonry surfaces of excess mortar

and foreign matter; use wood scrapers, stiff-nylon or -fiber brushes, and clean water, spray

applied at low pressure.

1. Do not use metal scrapers or brushes.

2. Do not use acidic or alkaline cleaners.








B. Wash adjacent woodwork and other non-masonry surfaces. Use detergent and soft brushes or

cloths.

C. Clean mortar and debris from roof; remove debris from gutters and downspouts. Rinse off roof

and flush gutters and downspouts.

D. Sweep and rake adjacent pavement and grounds to remove mortar and debris. Where necessary,

pressure wash pavement surfaces to remove mortar, dust, dirt, and stains.

3.12 FIELD QUALITY CONTROL

A. Contracting Officer's Project Representatives: Contracting Officer will assign Project

Representatives to help carry out Contracting Officer's responsibilities at the site, including

observing progress and quality of portion of the Work completed. Allow Contracting Officer's

Project Representatives use of lift devices and scaffolding, as needed, to observe progress and

quality of portion of the Work completed.

B. Notify Contracting Officer in advance of times when lift devices and scaffolding will be

relocated. Do not relocate lift devices and scaffolding until Contracting Officer's Project

Representatives have had reasonable opportunity to make observations of work areas at lift

device or scaffold location.

END OF SECTION 040120

Date post:	27-Jul-2020
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